Untrace_var is permitted at safe level 4.

untrace_var在safe level 4是允许的。

youdao

Really, the safe level of exposure is no exposure.

吸烟真正的安全水平就是一点儿都不吸。

youdao

There is no safe level of second-hand tobacco smoke.

二手烟草烟雾没有安全标准。

youdao

But clearly there is no such thing as a safe level of cigarette smoke exposure.

VOA: special.2009.06.03

There's a lot of engineering that we've already talked about in terms of producing quantities of the vaccine, producing it reliably, producing it safe, distributing it, and keeping track requires a level of sophistication that maybe you wouldn't have thought about initially.

我们已经讲过很多工程方面的内容,比如大批量制造疫苗,制造可靠的疫苗,制造安全的疫苗,分派发放疫苗,以及一个完善的随访监测系统,你们最早可能没有想过这些冬夜

耶鲁公开课 - 生物医学工程探索课程节选

He notes that research has found no safe level of lead.

VOA: special.2009.08.31

The goods seized from them included mascara with 20 times the safe level of lead.

BBC: eBay fake make-up sale: Leanne Wetheim sentenced

President VLADIMIR PUTIN (Russia): (Through translator) This has to be done, of course, at a moderate and safe level.

NPR: Russia Plans Nuclear Power Expansion

The European Union says no safe level of exposure has yet been identified.

BBC: News Online